Potential Laboratory Test Interference with Acetaminophen
Note: This information is also available in referenced form in the TYLENOL® product monograph.
Using the most current analytic systems, acetaminophen does not cause laboratory test interferences. However, there are certain methods with which the possibility of laboratory changes exist, as described below:
Acetaminophen at recommended doses does not appear to interfere with glucose analysis using currently marketed blood glucose meters. For further detail, it may be advisable to contact the specific laboratory instrumentation manufacturer.
Acetaminophen in therapeutic doses may interfere with the determination of 5-hydroxyindoleacetic acid (5HIAA), causing false-positive results. False determinations may be eliminated by avoiding acetaminophen ingestion several hours before and during the collection of the urine specimen.